Impulse sender



July 17, 1923.

M. SETTER IMPULSE SENDER Filed April 8, 1918 WI/AVVEE /\7/CHE,4/ grr 6.Q3.

n frae/vm Patented July 1?, i923.

f titan.

ra'rrs PA NT orr MICHEAL SETTER, or CHICAGO, ILLINOIS, As sre voa ToAUTOMATIC memo coir- PANY, or CHICAGO, ILLINOIS, A. conrone'r on orILLINOIS.

IMPULSE snnnnn.

Applicationfiled April8, 1918. Serial ltd/227,402.

"" To all whomc'timag concern:

Be it known that I. MIGHEAL SETTER, a

a dial is used to open and close a line circuit in accordance with thedigits of a called number.

I have chosen to illustrate n'iy invention in connection with a dialofthe character shown and described in Automatic Telephony by Smith andCampbell published in 1914, although it may be understood that myinvention may also be applied to any calling device of standardconstruction. i

The main object of invention is to provide improved mechanism foroperating a calling device of this character, whichmechanism whenapplied to a calling device pro 0 vides for a greater efliciency ofoperation and a longer life for the device. It is well known that adevice ofthis character when located at a subscribers station or at anoperators position is subjected. to a very.

great amount of wear and tear so that it is very necessary that allpartsbe as free from friction as possible. One of the elements ofthistype calling device has been the use of a spring as aratchet whichspring rides 40 over the top of a set of ratchet teeth as the dial isrotated in one direction and then catches in the tooth of the ratchet towhich it has advanced to bring the said ratchet wheel back with thefinger lever or dial to deliver impulses. A great deal of trouble hasbeen occasioned in the past from the use.

of this spring dog or ratchet as it was not well adapted to stand thestrainwhich it must undergo and also was liable to snap in cold weather.An object of my inven tion, therefore, is to provide an improved ratchetto replace this spring or any other device and one which will stand agreat deal 1 of wear and tear and in which the amountof t5 friction isreducedto a minimum,

Impulse Senders, of which ity "of ratchet teeth '7 on the 1 frontsurface In the drawings 1 have illustrated a calling device of thecharacter described showing the relation of my ratchet device to suchasender. Fig." 1 is afront view of the calling device. i i

"Fig. 2 is a side view of the same.

1' Fig. 3 is a rear view of the same. i v

FigsLd, 5 6 and 7 are detail views show-K ing elevationsof the variousparts of the device. 1

I will now explain in detail theconstrue tionand operat-ionof the deviceillustrated.

Referring to Fig.1 I have illustrated the frontplate orfinger hole diall pivoted at its central point ina base plate 2 (Figs. v52 :0 I

and 3) by mean'sof a. rod havinga coiled spring 3, oneend of which isfirmly secured to the end of rod lby means of a slot therein and theother end of which. is fastened to a. lug 5 on the under side ofthebase-plate 2. This spring 3 acts to return the finger hole diall to itsnormal position after'havin g been wound up by the rotation of the dialmanually in a clockwise direction. Loosely mounted upon the pivot rod 4:and rotatable I thereon is a combine'd gear and ratchet wheel 6"which isprovided*withgear'teeth around its circinnferenceand witha'pl-uralthereof. 'llheseratchet teeth 7 are equal in number tothenumber of holes in the finger .dial and are arranged to lie justunderneath the rear-surface of said dial for co-operation therewith. Indials previously made a circular spring having a dog out therefrom wasmounted on the rear face of the dial to co-operate with the teeth 7. "Ihave however provided a new dog and ratchet device. Through anopening inthedial lis placed a small metal dog8; which is'shownin detail in Figure6, this dog is cut 'out so thatone edge will fall into one of theratchetteeth 7 when the dial is normal. spring Sl -(Fig: 7 is providedhaving'a downwardly bent lip 10 which rides in the upper grooved faceofsaid dog 8and' maintains it"a't' all times with a slight tension tendingto press against the teeth 7 f A fibre piece 11 is provided; (Fig. 5)which fits over the spring '9 butis cutaway to allow for verticalmovement of'the lip 10; The manner in which the dog 8 and itsco-operating partsisafdapted to fit into the ratchet teeth is veryclearly shown in Fig. 4:, like parts being numbered ion a. worm wheel 14which drives theiis u al" governor l and a cam wheel 16 having two,wings adapted when the shaft is rotated to,

with the gear teeth in the circumference of which is pivotefd],in tliebracket l3 atone end and in a part of base plate 2 at'the other end.Mounted on this same shaft is open and close Contact of a pair ofsprings 17" and 18; which are usually used .tp send impulses, over thewell knowntwo wires oi. a telephone system to control automaticswitchesx-Aupair of springs 19 and 20 are also provided and are what isknown as the shunt springs; that ie, 'tl18SB SpI1IlgS are allowed to'c'loselby bushing 21 as soonpas the calling device leaves its normalposition and are used to-shunt the talking equipment at a subscribersstation to prevent the subscriber from bie'ing'annoyed by induct on;

@Now as the finger of a subscriber is 111- serted in onel'of the fingerholes of the dial 1,'- said dial is: first rotatedin a. clockwise 25direct-ion until} thefinger reaches the stop QQQ During this rotationthegear wheel 6 willrema'inin its normal position and the ratchet or dog8will simply ride up the inclinedfaceofieachltooth and drop into thenext, :against only the tension of-the curved lip {10,of spring 9. Whenjt-hBfiIIgQF of the operator;isremovedjhowever the spring 3 into whichtension was stored bythe forward. movement, causes the dial 1 to bereturned to normals In this movement the dogfi willlnot ride overtheteeth? as in the forwardmovement, but i will catch in the tooth :towhich it was rotated-and cause the V gear 6 to ,rotateiwith the dial 1back to -nor-,

malposition where it isstopped by a suitable s'top'; As the dog 8rotates'the gear 6,

the pinion. 121WlllfllSb be rotated and the return .movement. of theentire apparatus will therefore be regulated and timed hythe retardingactionofv the, governor 15. The result OfgtlllS return of the device ,tonormallisetheinterruption of the contact of the springs 17v and 18a-number of times cor;

"* mp nding tothenumber of. the finger hole .dialvinto which-thes'ubscribers finger was inserted. ;It.,-wi1l,;be 'seen,- therefore, thathaveprovldeda novel, and useful device for use .a ratchet which works upand down against the tension of spring 9 as the dial r0 ,55

tatesg-in one direction andwhich clamps itself' stationa-ry in the toothof the ratchet towhich itsis, advancedvtAlso it will be seen" thatthere; lsjvery, little friction caused by the operationiofi,this dog andratchet arone of its surfaces, a hand operated driving element; havingan'opening therein, a pawl adapted to be inserted into. said opening andcooperating with, said driving element, to drive said element, and aleafspring mount: ed adjacent said openingand having a] pro j'ection. whichacts as asole support for-sald pawl and holds it in engagement with, theratchet teeth of the driven element through said opening-Q, j a A 7 2.Ina'l'ratchet drivenmechanism, an el ement to be driven having ratchet,teeth on one ofitssu'rfaces, a hand operated driving element, an openingin said driving element, a. pawl 'a da otedlnto ,be inserted into saidopening; a leaf spring mounted adjacent said openingand having aprojection which holds said pawl in engagement with the ratchet teeth ofthe driven element through said opening, said spring so mounted thatitmay be moved away from saidopenin gi to allow said pawl tohe removedtherefrom. v v

3. Ina ratchet driven mechanism, a gear wheel 'adapted to d'rivethe-mechanism, having crown ratchet,teeth on oneside thereof, a drivingelement mounted adjacent said gear wheel, a pawl removably mounted inanopening therein in such a manner that when the element is moved in onedirection the pawl rides over the crown teeth and when moved in theother direction the pawl moves said gear wheelandaspring over the opening. oppositethe ratchet teeth" which tends to keep the pawlinengagement with the ratchet teeth said springbeing' held againstlateral, movement a groove in the pawl.

4L. Ina ratchet driven meolhanis'm a gear wheel adapted to drive themechanism hav ing crown ratchet teeth on one side thereof, a drivingelement mounted adjacentl said gear wheeha pawl removably mounted in anopening therein in such a mann er that when the element is moved: in onedirection the pawl rides o ver the crown teeth and when moved in theother direction the pawl engages said crown ;teeth',to;move said gearwheel, and a spring over thef opening opposite the; ratchet'teeth whiclrtendsflto eep, h "paw in e g em t th h ete t t t sa spri en e 1 hatkit my bemoizedqto one side of said opening to allow the pawl to be removed,I 1 7 5,111 a ratchet driven mechanism a gear wheel adapted to drive themechanism haw ing crown ratchet teeth on: one side thereof, a drivingelement mounted adjacent. said gear wheel, apawlremovahly mounted in anopening therein in such a manner that when the element is moved in onedirection the pawl rides over the crown teeth and when moved in theother direction the pawl moves said gear wheel and a flat spring mountedover the opening opposite the ratchet teeth which tends to keep the pawlin engagement with the ratchet wheel, said spring mounted so that it maybe moved to one side of said opening to allow the pawl to be removed.without changing the relative position of the opening with regard to theratchet teeth.

6. In a ratchet driven mechanism, a gear wheel adapted to drive themechanism hav ing crown ratchet teeth on one side thereof, a drivingelement mounted adjacent said gear wheel, a pawl removably mounted in anopening therein in such a manner that when the element is moved in onedirection the pawl rides over the crown teeth, and when moved in theother direction the pawl moves said gear wheel, a spring over theopening opposite the ratchet teeth which tends to keep the pawl inengagement with the ratchet teeth, and a washer having an openingtherein mounted over said spring to hold the same on the drivingelement, for permitting a portion of the Spring to be movable with thepawl as it rides over the crown ratchet teeth. x

7. A ratchet mechanism having a driving element, a pawl carried thereby,a driven element having ratchet teeth co-operating with the pawl, saidpawl loosely mounted in an opening in said driving element, and a springcovering one end of said opening and acting to keep the pawl inengagement with said teeth, said spring so mounted that it may berotated away from said opening to allow the pawl to be removed therefromwithout changing the relative position of the driving element to thedriven element.

8. In a ratchet driven mechanism, gear wheels for operating saidmechanism, a hand operated driving element, ratchet teeth on one of saidgears, a pawl for communicating the motion from the driving element tothe gears by engagement with said ratchet teeth, said pawl inserted inan opening of said driving element, a leaf spring for holding said pawlin place,,said pawl having a groove therein for holding said springagainst lateral movement.

9. In a ratchet mechanism, a gear train, one of said gears having crownratchet teeth a on one side thereof, a hand operated driving

